JPH07249278A - Optical disk cartridge - Google Patents

Abstract

PURPOSE:To form an optical disk cartridge capable of realizing maintenance free for a long term by incorporating an optical disk and an optical head in a case of the optical disk cartridge sealed hermetically. CONSTITUTION:The optical disk 2, the optical head 7, an optical head driving means (linear motor) 6 are incorporated and sealed hermetically in the case 1 of the optical disk cartridge. Thus, since the optical disk 2, the optical head 7 and the optical head driving means are separated from a space including much dust, etc., outside the case 1 of the disk cartridge, they are operated in a clear atmosphere always, and no dust is stuck to the optical disk 2, the optical head 7. Thus, since no laser beam is shut out by the stuck dust, no light quantity is lowered.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk cartridge used in an optical disk device for recording and reproducing information on a rotating optical disk by using a laser beam.

[0002]

2. Description of the Related Art Conventionally, Japanese Patent Laid-Open No. 4-137290
JP-A-4-109471, JP-A-4-10947
As in the technique described in Japanese Patent Publication No. 4, when used, an optical disk cartridge in which the optical disk is completely sealed by a case member is mainly an optical disk 2 and a rotation center shaft fixed to the optical disk 2 as shown in FIG. 3, a bearing portion 4 that holds the rotatably with high precision, and a cartridge case 1 that includes these. A part of the cartridge case 1 has a transparent window 8 extending in the radial direction of the disk on a surface parallel to the disk surface for transmitting laser light. Also, a rotor 9 fixed to the optical disc for rotating the optical disc in accordance with an external magnetic field.
Is equipped on the inner circumference.

FIG. 10 shows a state in which the optical disk cartridge is mounted in an optical disk device. The optical disk cartridge is a spindle motor 1 for rotating the optical disk 2 by magnetically coupling with the rotor 9.
08 is held in proximity by a transport device or the like (not shown). The optical head 13 having the objective lens 5 is held below the transparent window and is movable in the radial direction (radial direction) of the optical disc 2.

During operation, the objective lens 5 is controlled so as to focus on the recording surface of the optical disc 2, and the distance between the objective lens 5 and the surface of the optical disc 2 is normally maintained at about 1 mm.

[0005]

According to the prior art, since the objective lens is exposed in an environment in which a large amount of dust or the like floats, in the long-term use, fine floating substances such as dust may be left on the objective lens. Settles and adheres. As a result, the laser light may be blocked, which may hinder the recording and reproducing of information. In other words, it seems that the conventional optical disc cartridge has taken measures against dust on the disc, but does not consider the objective lens. In this case, maintenance is difficult, such as cleaning the objective lens regularly.

As described above, the objective lens is controlled so as to focus on the surface of the optical disk during operation, but the distance between the objective lens and the recording surface of the optical disk is usually about 1.
If the thickness is about mm, the thickness of the transparent window portion needs to be further reduced to less than 1 mm, which is very difficult in manufacturing and assembling, and there is a great risk of damage in operation.

The present invention has been made in view of the above problems, and an object of the present invention is to provide an optical disk cartridge having a relatively simple structure and capable of extremely reducing the adhesion of dust to the optical disk and the objective lens.

It is another object of the present invention to provide an optical disc cartridge which can eliminate the need for the transparent window.

[0009]

In order to solve the above-mentioned problems, according to the present invention, in an optical disk cartridge in which an optical disk is sealed with a case member, a laser beam is received from the outside and the optical disk is moved in the radial direction of the optical disk. It is possible to provide a movable part that moves and irradiates the optical disk with the laser light, and at least the movable part can be sealed together with the optical disk in the case member.

Further, a laser beam generating section for generating the laser beam may be integrated with the movable section.

[0011]

According to the present invention, an optical disk, information recording,
Since the reproduction optical head is enclosed in the case of the optical disk cartridge, it is isolated from the environment where there are many fine floating substances such as dust outside the case of the optical disc cartridge. Does not adhere to the lens.

Further, it is possible to provide an optical disk cartridge which is parallel to the optical disk surface and does not require a transparent window portion having an extremely thin thickness and which is less likely to be damaged in operation.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS.
Will be described. 1 is a front sectional view, FIG. 2 is a top sectional view, and FIG. 3 is a side sectional view. The optical disc 2 has a rotary shaft 3 attached to the optical disc 2 with high precision,
It is held by a rotation holding member 4 such as a ball bearing with good rotation accuracy. Further, a magnet 9 is attached around the rotation shaft 3 of the optical disc 2 in order to rotate the optical disc 2 by an external magnetic field. A movable part 7 of an optical head including an objective lens 5, optical components such as a reflection mirror, and an actuator (not shown) for moving the optical components is fixed to the case 1 in the radial direction of the optical disc 2 below the optical disc 2. Bearing 23 on the rail 22
It is attached so that it can be moved smoothly. Further, the coil 6a of the linear motor for moving the movable portion 7 of the optical head in the above-mentioned direction is provided in the movable portion 7 of the optical head.
In addition, the fixed yoke 6b of the linear motor and the magnet 6c of the linear motor are attached to the case 1 of the optical disk cartridge.
Is attached to. All of the above members are completely sealed by the case 1. In addition, a transparent window portion 18 for entering and emitting laser light is provided in a part of the case 1. The transparent window portion 18 does not need to be thin, unlike the conventional window portion 8 (FIGS. 9 and 10) which is parallel to the optical disc.

When the optical disk cartridge is mounted in the optical disk device, a spindle motor (not shown) is located below the rotary shaft 3 and is magnetically coupled to the magnet 9 fixed to the disk 2. further,
On the optical disk device side, there is provided a fixing portion 10 of an optical head including a laser light emitting device 25, optical components 24 and 26, an optical sensor (not shown), etc. A window portion 11 for emitting light,
The transparent window portion 18 for entering and emitting the laser light of the case 1 is closely attached. At the fixed portion of the optical head, the light emitted from the laser light emitting device 25 is collimated by the optical component 24, reflected by the optical component 26, and emitted from the emission window 11. This exit window 1
As shown in FIGS. 4 and 5, the portion 1 may seal the laser optical path via the tubular member 12. The tubular member 12 may have a bellows shape without any problem. The case 1 has a terminal group 19
Is provided, the coil 6a of the linear motor in the optical disk cartridge, and the actuator (not shown)
In addition, an FPC (Fleib) is attached to an optical sensor (not shown).
electrically connected via a le Printed Circuit (20) or the like. The FPC 20 is a flexible circuit board and is used for exchanging current / voltage and signals between the fixed part and the movable part. Further, a terminal group (not shown) connected to an electric circuit (not shown) is provided on the apparatus side, and when the optical disk cartridge is mounted in the apparatus, the optical disk cartridge terminal group 19
It is designed to be electrically connected to.

According to the first embodiment described above, not only is it possible to prevent dust from adhering, but the seek time can be shortened because the movable portion of the optical head is lightweight.

6 and 7 show a second embodiment of the present invention. This is a type including an optical head 13 in which the movable portion 7 of the optical head and the fixed portion 10 of the optical head shown in FIGS. 1 to 5 are integrated. In this case, since it is not necessary to input and output the laser light inside and outside the optical disk cartridge, the transparent window portion 18 for inputting and outputting the laser light shown in FIGS. 1 and 2 can be omitted. The electrical connection between the cartridge and the device is the same as in the first embodiment of the present invention.

According to the second embodiment, since the optical head is not divided into the movable portion and the fixed portion but is integrated, the positional accuracy can be improved.

Furthermore, a third embodiment of the present invention is shown in FIG. A laser light emitting device, optical parts,
The optical head 16 is composed of an optical sensor, an actuator for driving an optical component, etc. (neither is shown),
The arm can be rotated by a rotation actuator 17 about a rotation shaft 15 so that the objective lens 5 can be moved in a substantially radial direction of the optical disc 2. In other words, this embodiment is of a type in which the rotary actuator 17 is used instead of the linear motor as shown in FIGS. 1 and 2 for moving the optical head 16. The electrical connection between the cartridge and the device is the same as in the first embodiment of the present invention, and the case 1 of the optical disk cartridge is used.
When the device is loaded into the device, the terminal group 19 contacts the device side, the current / voltage is supplied to the rotary actuator 17 through the FPC 20, and the reproduction signal / control signal from the optical head 16 is sent to the device side through the FPC 20. To be

As described above, according to the present invention, it is possible to eliminate the need for a transparent window that covers the optical disk and that is parallel to the optical disk surface, and it is possible to provide an optical disk cartridge with a low risk of damage in operation.

[0020]

According to the present invention, it is possible to prevent dust from adhering to optical disks, objective lenses, and other optical parts.

[Brief description of drawings]

FIG. 1 is a sectional view of an optical disk cartridge showing an embodiment of the present invention.

FIG. 2 is a top view of an optical disc cartridge showing an embodiment of the present invention.

FIG. 3 is a side sectional view of an optical disc cartridge showing an embodiment of the present invention.

FIG. 4 is a cross-sectional view showing a method of closely attaching an optical disk cartridge and a fixed head according to an embodiment of the present invention.

FIG. 5 is a top view showing a method of closely attaching the optical disk cartridge and the fixed head according to the embodiment of the present invention.

FIG. 6 is a sectional view of an optical disk cartridge showing another embodiment of the present invention.

FIG. 7 is a top view of an optical disc cartridge showing another embodiment of the present invention.

FIG. 8 is a top view of an optical disc cartridge showing another embodiment of the present invention.

FIG. 9 is a side view of an optical disc cartridge showing a conventional example.

FIG. 10 is a side view showing a state in which a conventional optical disc cartridge is mounted in the apparatus.

[Explanation of symbols]

1 ... Optical disk cartridge case, 2 ... Optical disk, 3 ... Rotating shaft, 4 ... Bearing, 5 ... Objective lens, 6a, 6
b ... linear motor, 7 ... movable part of optical head, 8 ... transparent window, 9 ... magnet, 10 ... fixed part of optical head, 1
1 ... Laser light entrance / exit window of fixed part of optical head, 12 ...
Cylindrical member for sealing optical path, 13, 16 ... Optical head, 14 ...
Arm, 15 ... Rotating shaft, 17 ... Rotating actuator,
18 ... Spindle motor, 19 ... Terminal group, 20 ... FP
C, 21 ... Reflective mirror, 22 ... Rail, 23 ... Bearing, 24, 26 ... Optical component, 25 ... Laser light emitting device.

Claims (1)

[Claims] 1. An optical disc cartridge in which an optical disc is sealed with a case member, and a movable part which receives a laser beam from the outside and moves in the radial direction of the optical disc to irradiate the optical disc with the laser beam, at least the movable part. An optical disc cartridge, wherein the optical disc cartridge is sealed in the case member together with the optical disc.